Stellar groups of Orion's Sword region

We compiled a master catalog of stars observed in the optical, containing positions, proper motions, and UBV photometry for 1634 stars. Using the nearest-neighbor-distance technique, we subdivided the region into stellar groups with different numbers of members.

The positions of five groups coincide with known clusters, and two groups coincide with aggregates of stars with H{alpha} emission. We have identified groups with low membership that are moving away from the system. We also considered the kinematic structure of the groups using the AD-diagram method we developed earlier.